Platyreta germanica
| Platyreta germanica | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Platyreta | ||||||||||||
| Cavalier-Smith & Bass, 2008 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Platyreta germanica | ||||||||||||
| Cavalier-Smith & Bass , 2008 |
Platyreta germanica is a shell-less amoeba from the family Vampyrellidae , tribe Cercozoa . It is the only representative of the genus Platyreta .
features
The amoeba has many cell nuclei and reticulated pseudopods (reticulopodia). It has a multi-phase life cycle that is influenced by the availability of food. The food-consuming form (trophozoite) are between 50 and several hundred micrometers in size, the form ranges from spherical to elongated and heavily branched, but is usually flat. The fine, non-granular filopodia can arise anywhere on the cell. The trophozoite is mobile and changes its shape. It moves crawling over the substrate, with the filopodia resting on the substrate. The cell nucleus is spindle-shaped and around 2 micrometers in size.
The amoeba transform into cysts under different conditions : after eating or when dehydrated. Digestive cysts then turn back into trophozoites or cell division beforehand. When leaving the cyst, the amoeba flows out of the cyst wall through about 10 holes.
Cell fusion can also lead to plasmodia , which are usually very reticulate. They grow up to 1 mm. Sexual stages were not observed, but the presence of two-flagellated zoospores. These small swarmers are formed with rapid growth and can also swim with their pseudopodia.
Occurrence and nutrition
The amoebas are soil dwellers. They feed on fungal conidia , algae and nematodes . They ingest the food and pierce its cell wall. After that, the amoeba rounds up and becomes a digestive cyst. It forms several digestive vacuoles, which later combine to form a large central vacuole. The digestive cysts are egg-shaped and measure around 50 × 35 micrometers.
supporting documents
- David Bass, Ema E.-Y.Chao, Sergey Nikolaev, Akinori Yabuki, Ken-ichiro Ishida, Cédric Berney, Ursula Pakzad, Claudia Wylezich, Thomas Cavalier-Smith: Phylogeny of Novel Naked Filose and Reticulose Cercozoa: Granofilosea cl.n. and Proteomyxidea Revised . Protist, 2008 doi : 10.1016 / j.protis.2008.07.002